Merge pull request pi-hole#3597 from yubiuser/tweak/OS_detection

Adds OS and version to output if unsupported OS is detected

Author: dschaper

automated install/basic-install.sh

@@ -214,7 +214,7 @@ os_check() {
         fi
 
         if [ "$display_warning" = true ]; then
-            printf "  %b %bUnsupported OS detected%b\\n" "${CROSS}" "${COL_LIGHT_RED}" "${COL_NC}"
+            printf "  %b %bUnsupported OS detected: %s%b\\n" "${CROSS}" "${COL_LIGHT_RED}" "${detected_os_pretty}" "${COL_NC}"
             printf "      https://docs.pi-hole.net/main/prerequesites/#supported-operating-systems\\n"
             printf "\\n"
             printf "      e.g: If you are seeing this message on a fresh install, you can run:\\n"